E = E0 sin(kx - wt)yB = B0 sin(kx - wt)zThe simplest form of a traveling electromagnetic wave is a plane wave. For a wave traveling in the x direction whose electric field is in the y direction, the electric and magnetic fields are given by the picture shown above. This wave is linearly polarized in the y direction. In these formulas, it is useful to understand which variables are parameters that specify the nature of the wave. The variables E0 and B0 are the of the electric and magnetic fields.(A) maximas(B) wavelenghts(C) amplitudes.(D) velocities

Where the fields are sinusoidal, with amplitudes Eo and Bo

Then the correct answer is C

Explanation:

Given that,

E = Eo sin(kx - wt)y

B = Bo sin(kx - wt)z

The general wave equation is given above

Where the fields are sinusoidal, with amplitudes Eo and Bo

This shows that the Eo and Bo are the amplitudes

Also, the wave number k is related to the wavelength(λ)

k=2π/λ

And the angular velocity(ω) is given as

ω=kv

ω=v•2π/λ=2πv/λ. Where f=v/λ

ω=2πf

Where f is the linear frequency

In empty space, the wave propagates at the speed of light

i.e, v=c

The characteristic behavior of the sinusoidal electromagnetic wave is illustrated in the attachment

We notice that E and B are always in phase attaining maxima and minima at the same time

The relationship between Eo and Bo are

from Maxwell relations we know that

dE/dx=-dB/dt

E =Eoin(kx - wt)y

Then,

dE/dx=kEoCos(kx-wt)

dB/dt=wBoCos(kx-wt)

Then, equating them together

dE/dx=-dB/dt

kEoCos(kx-wt) = wBoCos(kx-wt)

Then, Cos(kx-wt) cancels out

kEo=wBo

So,

Eo/Bo = w/k

Since w/k=v=c

Then,

E/B=c

So the Eo and Bo are amplitudes of the electric and magnetic fields respectively

So the correct option is C

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia